docs(integration): record ai design history client merge

.project-docs/30-worklog/tasks/20260819-integrate-history-client-f18d.md

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+# Task: Integrate AI design history client fix
+
+## Identity
+
+- Task ID: 20260819-integrate-history-client-f18d
+- Mode: Integration
+- Branch: codex/20260819-integrate-history-client-f18d-history-client-final
+- Worktree: D:\mk-integrate-history-final-f18d
+- Base commit: bf0b805d9ff101dff2881ce1eb35a16332006673
+- Owner: codex-root
+- Status: Completed
+
+## Scope
+
+- Fast-forward completed source commit `bf0b805` to local `main` through an
+  isolated integration worktree, and record only the resulting canonical
+  current state.
+
+## Intent And Constraints
+
+- Treat source task records as read-only baseline material. Preserve the latest
+  ten-message cursor page, identity guards, and bounded stream cleanup; do not
+  package or deploy the client as part of this local integration.
+
+## Outcome
+
+- Fast-forwarded source commit `bf0b805` without conflicts, recorded its
+  canonical current state, and promoted the verified integration branch to
+  local `main`.
+
+## Verification
+
+- Source task verification: the full client Vitest suite passed (2,167 tests),
+  and TypeScript/lint checks passed.
+- Integration ancestry: `main` is a direct ancestor of `bf0b805`; this
+  integration base is the exact source commit, so source task-owned documents
+  remain baseline material.
+- Integration full Vitest run passed 2,166 / 2,167 tests; one login direct-route
+  timing test passed immediately when rerun in both the source and integration
+  worktrees. Typecheck and affected-file ESLint passed.
+
+## Follow-ups
+
+- No packaged-client or deployed-service smoke is recorded.
+
+## Promotion Candidates
+
+- None recorded.